Improved boiler for treating straw



UNITED STATES PATENT OFFICE.

T. A. NIXON, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVED BOILER FOR TREATING STRAW.

Specitication forming part of Letters Patent No. 50,266, dated October 3, 1865.

To all whom it may concern:

Be it known that I, T. A. NIKON, of Philadelphia, Pennsylvania, have invented an Improved Boiler i'or Treating Straw, Sac., for the Manufacture of Paper-Pulp; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention consists of a horizontal revolving boiler having tubes through which pass the products of combustion from a fire-place, the said tubes serving the twofold'purpose of thoroughly agitating the straw or other librous matter and alkali in the boiler and of rapidly communicating the desired heat to the contents, thereby quickly converting the straw, tbc., into paper-pulp of a superior quality.

o My invention further consists in the combination of the said tubular boiler with a tireplace and root' peculiarly arranged in respect to the tubes, in order that the latterl may not be burned by the passage through them of excessi vely-heated products of combustion.

In order to enable others to make and use my invention, I will now proceed to describe its construction and operation.

On reference to the accompanying drawings, which form a part of this speciication, Figure l is a sectional elevation ot'my improved boiler for treating straw, Gac., for the manufacture of paper-pulp 5 and Fig. L', a transverse section on the line l 2, Fig. l. y

A is a cylindrical boiler, round which, near each end, extends a band, a, each band rest ing on grooved or flanged pulleys Z1, which turn in suitable bearings in foundation-plates B B. Through the boiler extend horizontal tubes c c, arranged in the manner illustrated in Fig. 2, the said tubes communicating at one end with a fire-place, O, and at the opposite end with a chamber, D, there being a circular opening in the wall of the fireplace, as well as in that of the chamber, into which openings theends of the boiler it nicely, but so that it can turn freely.

The fire-place O is provided with the usual grate, d. The root' j' of the tire-place, however, is level, or nearly level, with the center of the boiler-head, as shown in Fig. 1, the chamber C' above the roof f communicating with a chimney, F.

To the boiler, near the front end of the same, is titted a cog-wheel, g, into which gears apinion, c, on a shaft, H, the latter being connected with any suitable driving apparatus.

The straw or other material to be reduced to pulp is placed in the boiler, together with a quantity of alkaline liquor ot' the proper strength. A iire is then kindled in the tireplace and a rota-ry motion is imparted to the shaft H and to the boiler. As' the boiler revolves the products of combustion from the fire-place will enter those tubes c the ends of which are below therooff, and willpass through these tubes to the chamber F, from the latter into the uppermost tubes, c, and thence to the chamberG/,andtothechimney. Theproducts of combustion, while at their highest temperature, are thus broughtin contact with the surface of those tubes only which are immersed in the liquor, the partially-cooled gases, after escaping from these tubes, being conducted through the upper tubes, which are above the surface of the liquor, and could not therefore be heated to so great an extent without being burned. As the boiler revolves theliquor will be thoroughlyv and constantly agitated by the tubes, and will be thus raised to a high tem perature in a very short ltime-an important fea-ture, inasmuch as the best pulp is produced by a quickly-applied heat. At the same time the constant agitation of the contents ot' the boiler causes the straw or other material to be rapidly converted into pulp.

I claim as myinvention and desreto secure by Letters Patentl. The combination, with a horizontal revolving boiler, of tubes c c, through which the products of combustion are. caused to pass, and which maintain the contents of the boiler in constant agitation, for the purpose specified.

2. The revolving boiler A, with its tubes c c, in combination with the lire-place C and its rooff, the whole being arranged substantially as and for the purpose herein set forth.

In testimony whereofI have signed my name to this specication in the presence of two subscribing witnesses.

T. A. NIXON.

Nitnessesz CHARLES E. FosTER, r J oHN WHITE. 

